Friction cutting machine



5 SHEETS SHEET 3 Jan; 2, 1923.

L N' m9 L?. wml s., 2 mm2 IIT MT. uw JCN N D JmE TL, mF R F Jan. 2, 1923. 1,440,616

J. J. MIKSHEL, FmcTloN CUTTING MACHINE.

FILED Nov. 22, |919. 5 SHEETS-SHEET 4 Jan. 2, 1923. 1,440,616

J. J. MxKsHEL.

FRlcTloN Cu'r'rms MACHINE. FILED Nov. 22. l9l9. 5 SHEETS-SHEET 5 www and therebv reduce the length o1 the 40 nection between :1 V feed nieto?.

letented dan. 2, i923.

K .ml fue Uitl ENQ' JOHN J. MIKSHEL, ononroneo. rnninois, Assienonfro .msnen 'n nYnnsoN as son,

- A oonronerron on rnnrnors.

yFEIION CUTTING TJIACHINE.

Application led November 22, 19.19. Serial No. 340,065.

To all wl/iam. it 'muy @awww/v.' i

Be it known that l, Joint J. lillinsnnn, u

citizen ot the United States, and e. resident ot Chicago. in the countyv ot Cook and State 5 oit' Illinois, here invented certain new and useful Improvements in Fricown Cutting Machines; and l do herebyv declare that the lollowing is e. full, clear, and exact description thereof. reference being had to the :1e-

eoinpenving drawings., and tothe characters of reference marked thereon, which torni e. part of this specification.

This invention relates 'to improvements in friction saw machines tor sauving motel;

i5 und is he 'ein shown nsndapted to that they 'tor instance, es the if sew inne o illustrated 1n [the 'error patent to lldvrerd Hendee. No. l.; O95 'grented on the th Vclay or". Way. 1916,

-'.Xinong the ologects ot the inesent inven- 25 tion is to so Construct the carriage by which the sew ledej which is directly oonneeted to the motor slrfrlt7 and the motor that the seid :serblade and motor are so bnlzfineed rele.- tivelv to the enrrizre :as to miniiniye vibra- LSO tion ot the sew blade when in operation.

.nother object ot the invention to Corb struct the carriage and to inonnt it on the machine leerse in such a way estov nietnially reduce the eiieetive length oit the risp.

bese or 1' :une on which the cnrriofo isnlollnted und redireD the '.feinjht oit these n ier ehieet of the invent;

an improved transmis .on drive Connjiountc-d on the machine frame.. und thc sew blade dri vine; mechanism esto control the 'toed sneed ot 'the 'iththe work through which the blade is en so es to l5 thereby avoid overloviri' o' the sew bl; `le

driri rnoor,4 the er' strnotion anni :izi'zmlienf beingz such that when the load on' the en blade s small. :is when cutting through reiativelv -L material the Jfeed speed of the is @renter than when the sew blade is cutting throneh heavier sections of ins-rterial. so that therebythe peripheral travel oit the saw blade may be maintained ap-` proximately ,Constant when cutting through different cross sections of material. il further object of the invention is to provide novel ineens of supplying cooling` was oid flushing the-saw blade at the point lere it 1s Cutting through the material,

nother object of the invention is to' control the sparks thrown rearward by the sind to direct thein to the cooling;` water drain portion of the hood. i

inotherobject ot the invention is to proe un improved ineens of controlling;` the ,fel of the carriage at the beck lirnit ot'its travel. the controlling mechanism `cO-operriting 1with a feed motor control in such a way that the Carriage or table is permitted to 31;'michiel.Q slow down after the control meel :mism hes thrown the Controller to neutral;

@ther objects ofthe invention are to irnii i, the.

'Figure l is e side elevation of a 'friction saw machine'ernbodying` inv invention. Fionrc 2 is a.` front elevation thereof.

. 8 is o. planview of the inamiine.

; e vertical section of the inathe drivingy rneehanisin.

3 a fragmentary side elevation the driving' mechanism from the inotor to theemriage table.

. Iejnre (5 is an axial seotion of n portion mi lho sew 'feed driving.;f mechanism.

" igures 7 and are details ot the. tripdogs which are movable with the earri or table for throwing' thefifeed inotor controller mechanism to neutral at the lirnits of travel of the carriage.

As showny the drswings,

10 designates to the saw blade in such a way as to the base oit' the machine which inay be .iliade ot any suitable shape or construction to support the carriage and the operative elements. blade supporting carriage or table, which is supported on the base. .ln accordance With the present invention said carriage cornprises a horizontal portion 12 which may be made hollow, as most clearly shown in Figure 4, and an upstanding bracket 14 which .is located at the rear ofthe horizontal portion 12 of the carriage. Said carriage is supported on the base through the medium of rollers 15, 15` the shafts of which are mounted in the sides of the carriage and in brackets 16 and 17 depending therefrom, said rollers resting and rolling on instanding tracks 18 at the sides of the base. The rollers l5 support the load of the carriage when at rest and in operation, and the carriage is prevented from raising vfrom the base by means of instanding flanges 19 Wnich are formed on the depending portions or aprons 20 of the carriage outside of the base, said instanding flanges facing up Wardly to constitute at their upper faces slide bearings that bear against downwardly facing tracks 2l which are formed at the outer sides of the roller tracks` 1.8 above referred to.

22 designates the saw or blade 'which is directly mounted on the shaft 23 of the motor ySaid inotor is fixedly bolted to a pad 25 which is forined on the rear Jface of the standard 14, said standard and its pad constituting-j a wall mounting` for the motor, generally similar to the construction shown in the aforesaid patent to llendee. The saw blade is located in a plane just outside ot the carriage and base, and is fixed on the motor shaft 23 through the medium` of clamping plates or spiders 26 of a diameter to embrace the saw a substantial distance beyond its axis of rotation. The said .motor Z/l is fixed to the bracket orsupport 14- at one side of the vertical center of the bracket so that the center of gn'ayity of the combined Weight of the motor and the saw blade is near the center ol gravity o'l' the entire carriage load mass. 28 designates a work suppertingr table u `lich is mounted at the rear -end of the sauv traine on brackets 22k v30 which are bolted to the base the sides thereof and rise distance above the base, The said support extends laterally beyond'the traine and carriage at the saw blade side ot themachine, and transversely slotted at 31 to receive the saw blade. The brackets 29, sustain the work support 28 above the plane of the carriage such distance as to permit the rear horizontal portion l2 of the carriage to pass beneath the Work support when the carriage and the saw blade carried thereby are at the limit et cutting travegsaid Work support being 1l designates as a Whole the saW pro\f'ided with ineans of any suitable character to hold the Work in place While the saw blade cutting therethrough.

A i''eature ot the invention to be observed, and which will be clear from what has been said, is that the inotor and the saW blade are located centrally with respect to the length of the carriage, this construction contributing` to bringing the mass Weight of the carriage, the saw, and motor near .the longitudinal center of lthe carriage. Thereby, this construction and arrangeirent,in connection with i'ixing the motor to the upstand-' ing bracket laterally at one side of the een ter of the bracket, has the effect to balance the moving` parts ot' the machine, to -Wit, the carriage, thev motor, and the saw blade so that. in the rst plate, vibration of said parts, due to the inipact of the sau7 against the Work and to the high speed of the saw, is reduced to a minimum, and, secondly, it becoines thereby possible and practicable to materially lessen the length of the carriage, and also lessen the tendency. of the Contact ol' the saw blade with the Work tippingy the carriage upwardly, especially when the sauw rst attacks the Work. Th features of construction thereby enable the saw tobe operateifl with less ioiver, due to the balancing of the operative parts, lengthens the life 9 o'i the saw, dile to the niiniinif-ied vibration in operation, and substantially reduces the material i'ieressaiy to construct the base and carriage, and vtliereby `greatly reduces the cost ol the saw machine. The carriage operated to feed the saw blade and its operating' motor towards and away troni the Work by means inade as follows:

35, 35 designatevrack bars ra/hich are tached to the said dependingv aprons 2l ot the carriage, one at. .each side and exterior to the base. 36 designates a feed sha'tt which extends tzi'arisi-fei'sely across the base and is rotatiyely mounted in l'iearing's 37 fixed to the base. Said 'feed shaiit carries pinions 38, 38 which mesh with the racks 35. The feed shaft 3G may be rotated by hand orinotor power. lt may be driven by hand power by extending` 'the toed shait 3b beyond one side oi the traine as bidh-ated at l0 and applying operati: thereto The' ingy the lo an: riage to more tow: s .Y shown as made folloas:

de lates a .feed motor tively small horsegmu'cr that 'is bolted or otherwise lined to the base l() at the sido of the machineA The shaft of said motor is: connected through a Vfruition driro lnecha- 1;.2'- nisin designated as a `whole by l, and Afereinafter incre Yfully described, to a shaft a5, on .vhieh is fixed a Worin a6, the shaft l5 being mounted in suitable bearings 47. The Worm i6 meshes with a Worin gear e8 that and' the saw blade is controlled to corre' spond to the load .against which the saw blade is driven, said control mechanism is best shown in Figures 1, 5,'and 6 and is inade as follows: v

rEhe shaft 83 of the feed motor L1B is connected by a coupling 841 to the driving shaft 85 of the friction control device; and ysaid latter shaft is connected throughv a friction control device to the drive shaft before referred to, which; constitutes part of the train of the driving niechanisni for the traveling carriage. Said shaft 85 extends loosely through a sleeve 87 which is rotatively mounted in a bearing portion 88 of the friction control casing comprising two rneinbers 891 90. The member 90 of said casing embraces an end wall 91 and a cylindric flange or shell 92 which latter is inter nally threaded to engage coinplernental threads on an annular flange 93 of the ineinber 89, the two members thus connected enclosing a chamber 911 into which the driving shaft 85 extends and which receives oil to 'immerse the friction elements of thedrive, now to be described. l The transmission shaft l5 which carries the worin 16 extends into a sleeve portion 95 of the rneinber 90 of said casing and is pinned or otherwise non-rotatively secured thereto to constitute a driven shaft. Splined on the end of the shaft S5 within'the charnber l911 is sleeve 96 which is formed at its end remote from the shaft 115 with a heav. flange 97. Arranged between said flange 9 and the end wall 91 of the casing member 90 are a plurality of discs which are adapted to be pressed together by a heavy backing spring 98 which surrounds the shaft 85 and is interposed between the flanged sleeve 96 andv a thrust bearing 100 that lies against the inner end of the sleeve 87. The said frictiondiscs are alternatively connected to the sleeve 96and the cylindric shell portion 92 of the casing, They comprise rings or discs 101 (Figure 6) which are notched at their innerv` peripheries to interloclr with rlonf-gitudinal external ribs on the sleeve 96n and other rings or discs 103 that are notched at their outer peripheries to interloclr with other ribs 104; carried by the cylindric shell portions 92 of the casing. lt will thus be :harias i e and steel7 respectively, being used in practice. The said driving and driven discs are adapted to be spring-pressed together between the flange 97 and the end wall 91 of the casing by means of a lever 107 that may be hinged to any rfixed portion ofy the inachine, as at 108 and is provided with pins 109 that engage in a groove 110 of an en; larged part of the sleeveS (Figuresl andl 5). Therefore, when the lever is swungvto the left, as shown in Figure 1, the sleeve 87 is forced inwardly and acts through the spring 98 yto increase the pressure between the driving and driven discs; and this pressure will be adjusted relatively to a safe load onthe saw blade operating motor 24.' lf this predetermined load on the saw blade operating` motor be exceeded, there will be a slippage between the .friction discs of the friction drive describechso as to slow ydown` the carriage travel and thus relievefthe saw blade operating motor until the cross section of the work is such that the blade may be safely fed faster into the work, whereupon the pressure among the friction discs will transmit the full driving power of the feed motor 13 to the carriage. It has been found that this friction drive connection between the motor and the table is verysensitive to control the feed of the saw blade to the work and prevent an overload on the saw beyond a predetermined safe overload. The said friction control lever is adapted to be locked in a given vadjustment by a' springheld dog 112 on the lever 107, whichis adapted to engage an arc shaped series of teeth 113 on a curved bar 114; iiXed on the knflachine base. as shown in Figure 5; and

the spacing of the teeth. and the leverage of the controller lever are such 'as to give very delicate pressure control on the power transinission discs. Y

The saw blade is enclosed in a comprising the two parts 119, 120, the former of which is fixed to an extension 121 of the carriage and the latter of which'is hinged at 122 to the fixed portion so that it may be swung away from the saw blade when a blade is to be replacechor for other purposes. Cooling water is delivered' on the saw; in the hood through a pipe .123, which preferably has the forni of a fieiriblef hose? that is connected to a pipe 124i which l leads from a source of water supply, and is provided with a cut-out valve 125, The pipe 123 terminates inside the hood in a curved perforated spray head 126 which is located. in rear and below the axis of rotation of the saw blade, corresponding in curvature' to the saw blade" periphery and spaced 'a suitable distance therefrom. Said spray head may be located in the plane of the saw blade and may be provided withl a row of spray apertures to direct the cooling water or other medium against the saw Ahood 118 i Al (l blade at its cutting edge. AIn order to prevent the cooling water, which tends to cling to the blade, being carried by the saw blade directly to the worlr, downwardly and torwardly inclined defiectors 128 are att ched to the inner side of the hood members in the manner most clearly indicated in Figures 1 and 3, and these detlectors are located with their edges close to the opposite sides of the saw blade so as to deilect or scrape the film of water that tends to atlliere to the saw blade and to dii-ect the water thus'delected downwardly and backwardly away from the cutting edge of the saw blade and the'worlr and to a drain trough 129 below tliefplane of the carriage, so that cooling water in large quantities will not ind its way to the part of the work through which the saw blade is cutting'. Thereby the cool` ing influence oi4l the water is applied to the margin olf the saw blade closely adjacent to the point where the blade emerges troni the work and cools the blade trom that point- 'abi'east the deilectors 128 which has the ei:-

ifect to sulticiei'itly cool the saw blade margin,`

and the (reflector, as beiore stated, prevents the water being thrown in large volumevon ie work with a tendency to chill the wort; rnd thereby hinder the cutting action oi the iw blade to such extent as to decrease the cuttng efficiency of the saw blade thereon. Home water will iind its way to the worlr table, however, and in order to prevent this water and sparks wari'lly over the wei-l; table and on to the thereof an upright water mechanism in rear shield 13() is pi ided which rises from the table throughout tbe width thereof and is so arranged as to intercept the sparks and to direct the water towards and ott the end of the table into said trough 129. I

The louer marginal portions of the hood members above lthe vertical work clearance turn inwardly as at 131 (Figure 2) to catch 't oi the water that clings to the saw blade beyond the deiiectors being` thrown downwardly on to the work support. libe water trough 129 is connected to the hood members by the vertical spaced portions 132 that connect at the lowermost portions 1233 thereof (Figure 1), and in order to prevent sparks being thrown past the rear ed oi" the vertical portion 132 a detiector lo-T igures 2 and 3) is i'ormed'on and turns out laterally ifi-oni the vertical rear margin ot' the outer member to be thrown rearward from the cutting edge et the blade in a ilaring fashion.

ln order to prevent the saw running rearwardly on the traine to a distance that would deniesh the driving racks 35 from the pinions 3S, stops 135 are provided at the rear end of the traine in the path of a bar 13G oi any suitable construction on the carriage. Should the carriage be iioating away from ndii'ig their way back- 132, the sparks tending the work yafter the controller lever has been thrown to neutral the-friction drive betweei'i the feed motor and carriage driving` gear would tendtoabsorb the inertia of the table after said stops 135 and 136 werevbrought together.

While the improvements herein disclosed y have been described `wth'particular reference to a high-speed friction saw, it isto be understood that some of them may be adaptn ed to saws or cutting machines of diiiierent types within the spirit and 'scope of the claims hereto appended.

except as topsuch claims wherein the details are specifically set forthl and `as imposed by the prior art, and that it is the intent to claim all oi inherent novelty herein disclosed.

.I claim as my invention,-` 1. A metal `friction cutting machine, coinprising a trame, a carriage movable towards and from the working position and provided with a motor supporting member near one, end ot the carriage, a motor and a directly comprising a rear elevated motor mounting,

and a 'forwardly extending horizontal ineni# ber wholly in t'ront ot the motor mounting for support on the frame, a motor and a directly connected saw blade supported on said motor n'iounting, and means to give for# ward and reverse movement to the carriage.y

3. A.k metal friction cutting' machine conifprising atrame, a reciprocable carriage movable towards and from `the work and com- It willbe further#v more noted that the invention is not limited f to the particular structural details shown,"

prising a rear elevated motor mounting having a vertical wall mounting for a motor,`

and a forwardly extending horizontal inember wholly in 'liront of the motor mounting, a motor and a directly connected saw blade supported on said motor mounting, rollers on which said carriage is supported from the traine,v and longitudinally extending sliding bearings on the carriage and frame topi-event the latter from rising relatively to the frame.

Ll. A metal friction cutting machine com`- prising a trame, a reciprocable carriage movable towards and from the work and comprising a rear elevated motor mounting,

and a forwardly extending horizontal meinber wholly in front of the motor mounting, a motor and a directly connected saw blade nel-roble supported on said motor mounting', said carriage being provided laterally exterior to the framev with depending aprons having toothed racks mounted thereon, a rotative shaft extending transversely across the frame, and pinions on said shaft meshing with said racks.

5. A metal friction cutting machine comprising a'fraine, a reciprocable carriage movable towards and from the work 4and comprising a rear elevated motor mounting, and a forwardly extending horizontal inember wholly in front of the motor mounting, a motor and a directly connected saw blade supported on said motor n'iounting, and a work support elevated from the front end of said frame beneath which the front end of the horizontal member of the carriage is adapted to extend'.

6. ln a machine of the character described, a carrialggel adapted to travel ona base and formed at its rear end with an elevated motor mounting, a motor mounted thereon, and a saw blade directly connected to the motor, the carriage extendiifip,` a substantial distance forwardly beyond the saw periphery.

7. ln a machine of thecharacter scribed, `a carriage, 'a motor and directly connected saw blade, and a mounting for said motor rising from the rear of the carringe, and so disposed on the carriage that the carriage is principally in front of said mounting` and the center of gravity of the motor, saw blade and carriage are disposed substantially at the longitudinal centery of the carriage.

8. ln a machine of the 'charamer described, a carriage, a motor and directly connected saw blade, and a niountinp` for said motor rising from the carriage, and so disposed on the carriage that the center of gravity of themotor, saw blade carriage are disposed substantially at .the longitudinal center ofthe carriage, the motor being horizontally mounted on the carriage with its center offset from the center of the carriage in a direction away from the saw blade.

9, A machi e of the character set forth, comprising` a base, a carriage movable thereon and embracing at its rear end an upstandinp; member and a forwardly entending horizontal portion wholly in front of said upstanding member', a motor and a directly connected saw blade supported on said upstandine' member, and power means constructed and operating' to delicately advance the carriage toward its work.

l0. A machine of the character dl l comprisinga base, work support the front end thereof, extendino f. beyond one side of the base, the base comprising a re x 1 bracket, and a horizontal member that is ll. A metal friction cutting macnine comprising a base frame, a carriage movable thereon towards and from the work and provided with a vertical motor mounting, having a mounting well, and wholly in front of said mounting with a horizontal portion supported on the frame through roller bearings, a motor lined to said motor mounting, and a saw blade directly connected to the motor, ,the ari 4ngement being such that the center of gravity of the saw, the motor and carriage is disposed centrally of the carriage.

l2. A metal friction cutting` machine comprising a frame, a horizontal carriage movable thereon towards and from the work and provided at its rear end with a vertical motor mounting, and having;` in front thereof a horizontal portion, tracks on said frame, bearing rollers carried by the carriage and resting and rollingon said tracks, a motor fixed to said mounting, and a saw blade directly connected to the motor and overhang;- ing the carriage and frame.

13. A metal friction cutting machine comprising a frame, a horizontal. carriage movable thereon towards and from the work and provided at its extreme rear end with an elevatcd motor mounting and comprising;` also a lower horizontal, forwardly ex# tendingportion, a motor fixed to said mounting, a saw blade directly connected to the motor, laterallyspaced tracks on the frame, rollers mounted on the carriage and resting` on the said tracks to support the carriage, and co-acting slidingv bearings on the carriage and frame to prevent the carriage from rising relatively to the frame.

le, Ametal friction cuttingmachine comprising a base provided with laterally spaced upwardly facing` tracks, a forward and rearwardly movable carriage provided with rollers which rest and roll on said tracks, said carriage being provided laterally eX- terior said rollers with depending aprons carrying downwardly f. eine', transversely spaced racks, shat eA nding across said base, pinions fixed to said shaft and meshing with said racks, anda motor and directly connected saw blade supported on said carriage.

l5.. A friction cuttinnjniachine comprising' ico downwardly facing bearings on said tracks to hold the carriage from rising, and amotor and directly connected saw blade mounted on the carriage.

16. ric-friction cutting machine comprising a `base provided with laterally spaced, upstanding tracks, a carriage having rollers which `travel on said tracks and vprovided laterally exterior to said rollers with downwardly extending aprons formed with longitudinal, upwardly facing bearings to engage downwardly facing bearings on the tracks, rack bars fixed to said aprons, carriage driving pinions meshing with said rack bars, and a motor and saw blade mountyed on the carriage.

17. A friction cutting machine comprising av base frame provided with laterally spaced, upstanding tracks, 'a carriage having rollers which travel on said tracks and provided exterior to said rollers with downwardly extending aprons formed with longitudinal upwardly facing bearings to engage downwardly facing bearings on said tracks to hold the carriage from rising, said carriage being formed at its rearend `with an upstanding motor mounting bracket and substantially in front 'thereof with a horizontal portion, a motor fixed to said motor mounting and a saw blade connected to the; motor and overhanging one side of the carriage and frame. i

18. A friction cutting` machine comprising a base frame, a carriage supported by and reciprocable on the frame, a motor and directly connected saw blade supported onV the carriage, and feed means'y for the car-` riage embracing` a feed motor, gearmechanism operatively connected to the carriage, and afriction drive connectedk between said gear mechanism and the motor, constructed with means to maintain the working thrust of the sawblade uniformly against work of different resistance values. g i

19. A friction cutting machine Vcomprising a base frame, a 'carriage supported by and movableon said frame, a motor` and direct connected saw blade' supported on the carriage, and feed means for the carriage embracing a feed motor, gear mechanism operatively connected to the carriage, and a friction drive connected between said gear mechanism and the motor comprising interleaned driving and driven discs for transmitting the feed motor power to the carriage.

20. A friction cutting machine comprisingabase frame, a carriage movable thereon, a motor and direct connected saw blade supported on the carriage, and feed means for the carriage embracing a feed motor, gear mechanism operatively connected to the carriage, interleaned driving and driven discs connected between said motor and gear mechanism, and means for varying the pressure of said discs against each other to thereby vary the feed power that can be i r each other embracing a 'sleeve slidable onf Athe feed motorjshaft and provided with an operating element and a spring interposed between one end of said 4sleeve and the group of transmitting discs. a ic 22. nl friction cutting machine compris-` ing anbase frame, a carriage movable there on, asaw blade carried by the carriage, and fee-d fmeans' for f the carriage embracing a drive connection comprising interactingv driving and drivendiscsc'onnected between said. motor andy carriage, and means'A for varying pressure of said discs againstleach other embracing ra sleeve slid-able on the feed motor shaft and provided with a lever operated spring interposed between one endof the sleeve and the group of discs, anda fine toothed ratchet fixed tothe frame adapta edjto be engaged fby a locking dogl carried by saidlever. y ,f y

23. The combination'witlra base frame, a carriage reciprocable thereon `and a cutting tool carried' by the carriage,o f `feed meansv to feed the carriage towards the work, embracing a feed motor and connections *be-4 tween 't'he feed 4motor and carriage embracing multiple, interacting driving and driven` discs' with yielding means to force them against each other and constructed to maintainl the cutting.- thrust'of the tool on the` work substantially constantgregardless ofv the cross section of "the work.A l f 2d. lThe [combination vwith a base frame, a Vcarriage reciprocable thereon andiacut i in i.

ting -tool carried by the carriage, Iof jfeedl' means to feed the carriage towards the work,v embracinga feed motorand connections between the feed' motor and carriage embraci ing multiple,,interacting driving 'and driven discs with vyielding means `to force them against eachother.

A friction cuttingimachine enil'iracing a base frame', a ycarria e supported by and movable on the frame and having anlelevated motor mounting anda forwardly eX-- tending horizontal portion wholly in rear of said mounting, a motor fixed to said mountv ing, a saw blade directly yconnected to said motor and overhanging the side thereof, and feed means for the carriage, comprisingv a" rack on the carriage, a driving gear meshing therewith, a driving shaft, and a friction shaft connected between said shaftand gear comprising interactingdriving and driven discs.

26. A friction cutting machine comprising base frame, a carriage reciprocable thereon, a rotary saw blade supported by the carriage, a hood enclosing the saw blade, a cooling water pipe extending into the hood and provided at the lower rear side of the blade with a spray head to direct a cooling medium thereon, and water deflector meansin the hood to remove excess water from the blade above engagement of the i blade with the work.

elements in the hood coacting with the bladel just before it enters the worl to direct excess cooling medium from the blade forwardly and downwardly i away from the work support. l

28. A' friction cutting machine comprising a base frame, a carriage reciprocable thereon, a rotary saw blade carried by the carriage, a hood enclosing the saw blade, means to spray a cooling medium on the saw margin just after" it leaves the work, downwardlyvand forwardly deflecting elei'nents vin the hoodcoacting'with the blade just before it enters the' work to direct excess cooling medium from the blade forwardly and downwardly away' from the work support, and a drain trough into which the recess cooling medium is directed. i 7 i 29. ln a friction saw the combination with a carriage and a saw blade overhanging and carried by said carriage, of a hood enclosingl the saw Ablade `above the work clearance, means to spray'cooling water on the margin of the saw blade as it emerges from the lworlr and deflecting means, to dei'lect the cooling water awayifrcm the saw yblade margin before it enters the work.

30. ln a friction saw the combination lwith a base frame having a worlrs'upport, a carriage movable thereon and a saw lblade supported on and overhanging the carriage,-of a hood fixed to the carriage comprising a portion above the. work clearance to enclose spring-pressed Leaders clearance in the plane of the hoodi movable thereon and a saw blade" ,fuiiported on and overhanging the carriage, of a hoodlined t the carriage comprising a portion ab'ovre the work clearance to en-V V"lose the saw blade, atrough below the of the woll; clearance inthe plane of the hood and connected to the hood, means to spray cooling water on the saw as it,

emerges from the work, and means lwithin hood to deflect water from the sidesl saw to the trough below, the lower marginal portion of the hood members being nwardly towards the saw.

39 ln a friction cuttingl machine, the combination with a. carriage and a saw blade supported on and laterally overhanging Vthe carriage, of a hood enclosing the saw blade above the worl: clearance, a cooling water trough below and in the plane of the hood,

and connected to the hood by upright members, one .of said upright members being formed with a deilector tovr deflect sparks thrown res-"wardly from the saw against thev other said upright member;

BS. ln friction cutting machine, 'they bination with a carriage and a saw blade ooi-ted on laterally overhanging the ege, of a hood enclosing the` saw blade above the worl: clearance, a cooling waterv trough below and in the plane of the hood, and -zfonnected to the hood by upright menibei's, one of said upright members being formed 'with a deflector to deflect sparks thrown rearwardly the saw against the other said upright member, means to spray cooling fluid against the saw blade just after it emerges from the work, and deflectors above the point of at tach ofthe saw blade on the worlr to deflect excess water therefrom to said trough.

ln witness whereof that l claim the foregoing as my invention l: hereunto yset my hand and ailii: my seal this 11th day of November, 1919.

JOHN J.

'Mnsnnn [a s] 

